Angled Beam Bearing on Supporting Beam

• Sep 7, 2022

• #2

phamENG

Structural

Feb 6, 2015

7,325

I've dropped the supporting beam a few inches and detailed a bent plate that can be welded at each end. If the reaction is high enough, include a gusset aligned with the web above inside the bent plate.

Rotating the supporting beam just creates other issues with the connection of that beam to columns, stability and torsion in the beam, etc.

 

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• Sep 7, 2022

• #3

KootK

Structural

Oct 16, 2001

18,271

If the girders connect to the sides of the columns rather than running continuously over tops of them, then I think that rotating the beams to suit is a great idea:

1) It would likely be the cheapest solution.

2) I believe that it would induce no torsion in the girders.

3) Surely the columns and diaphragm can handle the tiny bit of lateral thrust that this solution would imply.

Dropping the girder and fabricating some kind of level bearing seat is pretty conventional stuff where the girder can be dropped. That said, whatever form the seat takes, it would need to be done either at every single beam or continuously along the girder. There would be some modest $$$ associated with that.

 

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• Sep 7, 2022

• #4

KootK

Structural

Oct 16, 2001

18,271

A pretty economical seat might be something like this. Just keep an eye on bolt access and design the WT such that it doesn't flop over laterally. It appears that you have roll beams bracing each beam beam pair so your rollover concerns there should not be significant.

 

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• Sep 7, 2022

• #5

haynewp

Structural

Dec 13, 2000

2,306

I was going to suggest that same sketch which I’ve used before.

 

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• Sep 8, 2022

• #6

hoshang

Civil/Environmental

Jul 18, 2012

484

Hi
An unequal leg angle with the long leg welded to underside of the top flange laid upward may help.

 

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• Sep 8, 2022

• Thread starter
• #7

onlym112

Structural

Sep 9, 2019

45

Thank you everyone for your help!

 

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• Sep 8, 2022

• #8

JoshPlumSE

Structural

Aug 15, 2008

9,774

The OP's pictures make it look like the angle between the beams might be very slight.... If so, then I wonder if you can "shim" with a couple of slender wedge shims like we might do for wood. I guess that just takes care of the bearing. And, you'd need to drill a hole in a couple of the shim where you'd want your bolts.

I believe these shims are reasonably common for erection of base plates column connections to get them level prior to grouting. I've just never done this for a sloped beam like this.

 

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• Sep 8, 2022

• #9

driftLimiter

Structural

Aug 28, 2014

1,355

I have used a simple bent plate in this configuration especially when the roof slope angle is large. The connection would be a field weld though.

 

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• Sep 8, 2022

• Thread starter
• #10

onlym112

Structural

Sep 9, 2019

45

Yes the angle is very small

 

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• Sep 8, 2022

• #11

KootK

Structural

Oct 16, 2001

18,271

onlym112 said:

If so, then I wonder if you can "shim" with a couple of slender wedge shims like we might do for wood.

Click to expand...

I had considered this as well and wonder if one of our steel fabricator guys might be able to render an opinion. If there happens to be some "off the the shelf" shims of just the right pitch, I'd have to think that would be the way to go. If the shims would be custom fabricated, that would be another matter as I'm not sure how cost prohibitive (or not) that would be. Do fab shops just have big automated "shim grinders" tucked away in the corner or something?

 

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• Sep 8, 2022

• #12

KootK

Structural

Oct 16, 2001

18,271

I feel like we could use a few more sketches here. I assume that this is what we've been talking about with respect to a bent plate solution that the supported beam would need to be welded to.

 

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• Sep 8, 2022

• #13

KootK

Structural

Oct 16, 2001

18,271

This is a little more awkward mechanically but, if the clip were wider than the beam, you could bolt it down. I don't know that all -- or even any -- of the stiffeners shown are actually required. Their absence would imply the utilization of plate elements in bending however.

 

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• Sep 9, 2022

• Thread starter
• #14

onlym112

Structural

Sep 9, 2019

45

The fabrication company that I work for does not have a standard steel shim nor a machine that is capable of cutting out shim. We could use the plasma table to cut multiple thin shims according to the max plate thickness the plasma table can cut through. I believe some shops may have the machines that are capable of making shims.

 

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• Sep 9, 2022

• #15

haynewp

Structural

Dec 13, 2000

2,306

I have a project that I inherited after the framing layout directions were set. It has joists sitting on shim plates, the below is from the fabrication drawings. They made the shims continuous across the top of the girders on the shops instead of being a single shim under each individual joist.

I would still drop the girder (if possible) and provide the WT supports in the OP case and not mess with shims.

 

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• Sep 9, 2022

• #16

KootK

Structural

Oct 16, 2001

18,271

Thanks for the feedback on the shims gentlemen.

 

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• Sep 9, 2022

• #17

SteelPE

Structural

Mar 9, 2006

2,749

Seems like this is a situation the EOR should have addressed when he/she was designing/detailing the building. You can tell that the EOR is very unfamiliar with construction. I've had similar situations in the past and have gone the seat rout shown in KootK's first redline sketch. I will even fight the architect, if needed, to let me drop the elevation of the girder.

 

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• Sep 9, 2022

• #18

Smoulder

Structural

Apr 19, 2021

201

What about a round bar

 

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